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Proxy+ is a program that runs on a workstation or a server with MS Windows9x,
Windows NT, Windows ME, Windows 2000 or Windows XP and a connection to the Internet. Proxy+
works as firewall proxy server and mail server. All workstations can use Proxy+
services via the TCP/IP protocol.
Connection to the Internet
- dedicated (synchronous or asynchronous) or switched line connection
- only one IP address, which can be allocated dynamically by the ISP
- automatic dialing at user's or mail server's request
- automatic hang-up after a defined period of inactivity
- week scheduler for an alternate hang-up timeout
- support of ISP's modem multiseries
- manual dial/hang-up via a WWW interface
Firewall / proxy server
- separates the LAN from the Internet to protect from attacks
- insecure interfaces (connected to the Internet) are detected automatically
- cache increases speed of data retrieval and enables the use of data even if a connection isn't established
- proxy cascading enables the use of a parent proxy with or without ICP protocol support
- if the ICP protocol is used it is possible to define a few cooperative proxy servers at two levels: parents (at ISP) and siblings (at partnership company)
- ICP protocol effectively detects temporarily dead proxy servers and gives users continuous access to requested objects
- ability to access a listed source server directly (where access is enabled for permitted IP addresses)
Supported protocols and services:
- HTTP proxy for access to WWW pages
- HTTPS proxy for access to secured WWW pages
- FTP proxy for access to data at FTP servers directly from a WWW browser
- FTP gateway for access to FTP servers by FTP clients
- Telnet gateway enables terminal access by the Telnet protocol
- RealAudio proxy for playing audio/video distributed in RealAudio protocol
- SOCKS version 4 and 5 for the access of programs using SOCKS protocols
- POP3 mapped link enables easy communication between mail client and mail servers in Internet without using Proxy+ mail server
- DNS forwarder translates domain names to IP addresses
- configurable DNS cache
- Mapped links enable the use of protocols without proxy support (for instance IRC services)
Disc cache
- data stored in the cache from WWW and FTP servers increases the speed of retrieval by other users
- supports HTTP version 1.1
- advanced configuration of cached data validity verification
- explicit time-to-live of cached objects
- disabling of cache storage configurable
Mail server
- sends and receives mail for many Internet mail boxes at one time using the POP3 protocol
- full SMTP mail server for one or more domains
- option for leaving messages on POP3 server
- possibility to define restrictions for POP3 download (limit of message size, notification of big messages)
- optional APOP authentication on POP3 server (does not send password in readable form)
- messages from an e-mail box can be distributed to user groups
- sorting of incoming messages according to configurable rulesets
- treatment of MS Outlook and Outlook Express bug prevents from attack by means of Date: message header
- users can send messages even if a connection to the Internet isn't established
- intranet mail
- automatic dialing occurs at defined periods, or if the number of outgoing messages exceeds a defined limit
- week dialing scheduler
- enhanced support of the ETRN command makes the full SMTP server applicable even on a switched telephone line
- restriction of clients' relaying to the SMTP server can be configured to prevent the use of the server for spamming
- carbon copy of incoming and outgoing messages to file
- mailer masquerade enables the administrator to set the domain name in mail headers
- configurable resend if any transfer errors occur
- shorter interval between mail exchanges if switched line is connected
- configurable timeouts in communication with Internet mail servers
- configurable maximum length of outgoing messages
- SMTP supports unlimited number of recipients of one message
- it is possible to define list of external email addresses
- it is possible to schedule sending of a message at special time interval (large messages, low priority messages)
- it is possible to view messages ready to send (outgoing queue) and it is possible to delete a waiting message using WWW Admin interface
- plugin support which allows to check messages for viruses and dangerous attachments
- possibility to forward messages downloaded from POP3 servers or received by SMTP server to another local or remote recipients
Access restrictions and security
- a list of enabled LAN segments and/or enabled IP addresses of Proxy+ users
- access restrictions for listed or unlisted URLs
- automatic detection of insecure interfaces
- possibility to authenticate HTTP proxy service by user name and password
- access restrictions by time, content type (pictures, MP3, ....) or service (FTP, RealAudio, ...)
- each computer can use its own restrictions
Further features
- user list with grouping ability
- is configured via a WWW interface, access to the interface can be restricted
- support of regular expressions (e.g. in sorting rules, Access List)
- WWW interface for Ping and Traceroute utilities, available also from inside LAN
- display of status information (mail transfers, dialing,..)
- log files about dialing, mail processing, errors, and security violations information
- WWW server for intranet
- customizable error messages
- customizable AccessLog.TXT logfile format
- each parent proxy (parent or sibling) can have username/password assigned
- customizable Content-Type association table
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